WO2018167837A1

WO2018167837A1 - Occupant protection device, and method and program for controlling occupant protection device

Info

Publication number: WO2018167837A1
Application number: PCT/JP2017/010145
Authority: WO
Inventors: 博赤羽
Original assignee: 本田技研工業株式会社
Priority date: 2017-03-14
Filing date: 2017-03-14
Publication date: 2018-09-20
Also published as: US20200001813A1; CN110382310B; CN110382310A; JPWO2018167837A1; JP6757847B2; US11173860B2

Abstract

An occupant protection device, comprising: a collision prediction unit that predicts a collision state including a collision direction of a vehicle; a seat direction detection unit that detects a direction, relative to the vehicle, of a seat capable of rotating about a vertical axis of the vehicle; a drive unit that adjusts the degree of tension of a seat belt; and a control unit that controls the drive unit and changes the degree of tension of the seat belt in accordance with the collision direction relative to the vehicle as predicted by the collision prediction unit, and the direction, relative to the vehicle, of the seat as detected by the seat direction detection unit.

Description

Occupant protection device, control method and program for occupant protection device

The present invention relates to an occupant protection device, an occupant protection device control method, and a program.

Recently, there are vehicles equipped with a seat that can rotate in the horizontal direction. Such a vehicle occupant may board the vehicle in various seat arrangements. However, the seat belt is mainly designed to reliably restrain the occupant when the vehicle collides from the front. Therefore, if the occupant gets on the vehicle with the seat rotated, the occupant protection by the seat belt may be insufficient. The occupant protection device described in Patent Literature 1 controls whether or not to operate the pretensioner of the seat belt based on the detected rotation direction and collision direction of the seat. The occupant protection device described in Patent Document 2 detects a state in which the seat is rotated 180 ° rearward and controls the seat belt pretensioner not to operate.

JP 2016-175513 A Japanese Patent Laid-Open No. 10-129405

However, the conventional technology only controls whether or not the seat belt pretensioner is operated, and the tension degree of the seat belt is determined in consideration of the relationship between the collision direction of the vehicle and the rotation direction of the seat. There was no occupant protection to coordinate.

The present invention has been made in consideration of such circumstances, and controls the occupant protection device and the occupant protection device that adjust the degree of tension of the seat belt based on the relationship between the vehicle collision direction and the seat rotation direction. An object is to provide a method and a program.

The invention according to claim 1 is a collision prediction unit that predicts a collision state including a collision direction of a vehicle, a seat direction detection unit that detects a direction of a seat that is rotatable about a vertical axis of the vehicle with respect to the vehicle, The drive unit that adjusts the degree of tension of the seat belt, the collision direction with respect to the vehicle predicted by the collision prediction unit, and the direction of the seat with respect to the vehicle detected by the seat direction detection unit And a occupant protection device provided with a control unit that controls the degree of tension of the seat belt by controlling the tension.

The invention according to claim 2 is the occupant protection device according to claim 1, wherein the control unit includes the collision direction included in a predetermined angle range including a front direction when viewed from the seat. The drive unit is controlled to adjust the degree of tension of the seat belt to the first degree.

The invention according to claim 3 is the occupant protection device according to claim 2, wherein the control unit includes a predetermined angle range in which the collision direction includes either the left direction or the right direction as viewed from the seat. Is included, the drive unit is controlled to adjust the degree of tension of the seat belt to a second degree higher than the first degree.

The invention according to claim 4 is the occupant protection device according to claim 2, wherein the control unit includes the collision direction included in a predetermined angle range including a rear direction when viewed from the seat. The drive unit is controlled to adjust the degree of tension of the seat belt to a third degree lower than the first degree.

The invention according to claim 5 is the occupant protection device according to claim 1, further comprising a collision detection unit that detects a collision that has occurred in the vehicle, wherein the control unit is a detection result of the collision detection unit. Based on the above, the collision mode of the vehicle is determined, and the tension of the seat belt is changed by controlling the drive unit according to the collision mode.

A sixth aspect of the present invention is the occupant protection device according to the fifth aspect, wherein the control unit causes the vehicle to perform a predetermined rotation due to the collision based on a detection result of the collision detection unit. When it is determined that the vehicle is in a controlled state, the drive unit is controlled to adjust the degree of tension of the seat belt to be lower than the degree of tension when the predetermined rotation is not generated in the vehicle.

The invention according to claim 7 is a collision prediction unit that predicts a collision state including a collision direction of a vehicle, a seat direction detection unit that detects a direction of a seat that is rotatable about a vertical axis of the vehicle with respect to the vehicle, A control unit of an occupant protection device including a drive unit that adjusts the degree of tension of the seat belt, the collision direction with respect to the vehicle predicted by the collision prediction unit, and the seat detected by the seat direction detection unit A control method for an occupant protection device that controls the drive unit according to a direction with respect to a vehicle and changes a degree of tension of the seat belt.

The invention according to claim 8 includes a collision prediction unit that predicts a collision state including a vehicle collision direction, a seat direction detection unit that detects a direction of a seat that is rotatable about a vertical axis of the vehicle with respect to the vehicle, A control unit of an occupant protection device, comprising: a drive unit that adjusts a degree of tension of a seat belt; a collision direction with respect to the vehicle predicted by the collision prediction unit; and a detection result of the seat detected by the seat direction detection unit. The program is configured to control the driving unit according to a direction with respect to the vehicle and to change a degree of tension of the seat belt.

According to the first, seventh, and eighth aspects of the invention, the degree of tension of the seat belt can be changed based on the collision direction and the seat direction even when a collision occurs in the vehicle with the rotatable seat rotating. Therefore, safety in occupant protection can be enhanced.

According to the second, third, and fourth aspects of the invention, since the degree of tension of the seat belt can be adjusted to a predetermined degree based on the collision direction and the direction viewed from the seat, the occupant is reliably protected. At the same time, the occupant can be restrained from being excessively restrained by the seat.

According to the invention described in claim 5, the degree of tension of the seat belt can be changed according to the collision mode generated in the vehicle detected by the collision detection unit, and safety in occupant protection can be further improved. it can.

According to the sixth aspect of the present invention, when the collision detection unit detects that the vehicle is rotating, it can be adjusted to the degree of tension of the seat belt according to the rotation of the vehicle. Safety can be further improved.

It is a side view showing composition of an occupant protection device of a 1st embodiment. It is a top view which shows the structure of a passenger | crew protection apparatus. It is a block diagram which shows the structure of a passenger | crew protection apparatus. It is a figure which shows the acceleration produced by the rotation state of a vehicle seat at the time of a collision. It is a figure which defines the direction range with respect to the direction seen from the vehicle seat. It is a figure which shows the state which a collision produces when a vehicle seat rotates. It is a figure which shows the control state of the seatbelt apparatus applied in relation to the collision direction with respect to a vehicle, and a seat direction. It is a flowchart which shows the flow of a process of a member protection apparatus. It is a block diagram which shows the structure of the passenger | crew protection apparatus of 2nd Embodiment. It is a figure which shows the control state of the seatbelt apparatus applied in relation to the collision direction with respect to a vehicle, and a seat direction. It is a flowchart which shows the flow of a process of a member protection apparatus.

Hereinafter, an embodiment of an occupant protection device, an occupant protection device control method, and a program according to the present invention will be described with reference to the drawings.

FIG. 1 is a side view showing a configuration of an occupant protection device 1 according to the first embodiment. The occupant protection device 1 includes a vehicle seat 10 and a seat belt device 20. The vehicle seat 10 on which an occupant is seated is provided so as to be rotatable with respect to the floor surface F. A seat belt device 20 is provided on one side of the vehicle seat 10 to protect an occupant during a collision or the like. The vehicle (hereinafter referred to as vehicle M) on which the occupant protection device 1 is mounted is, for example, a vehicle such as a two-wheel, three-wheel, or four-wheel vehicle, and a drive source thereof is an internal combustion engine such as a diesel engine or a gasoline engine, an electric motor, Or a combination of these. The electric motor operates using electric power generated by a generator connected to the internal combustion engine or electric discharge power of a secondary battery or a fuel cell.

The vehicle seat 10 includes, for example, a seating part 11 and a backrest part 12. In the vehicle seat 10, one end of the seat portion 11 and a lower end of the backrest portion 12 are rotatably connected by a first connecting portion 18. A headrest 13 is provided at the upper end of the backrest 12.

The seating part 11 is a member that supports the lower body of the occupant. The seat portion 11 is formed with a seat surface 11 a on which the occupant D is seated. The seat surface 11a is formed of a cushioning material. The seating part 11 is attached to the floor surface F via the rotary connection part 14. The seating portion 11 is disposed so as to be rotatable around a rotation axis L1 that is a vertical axis with respect to the floor surface F by the rotation connecting portion 14.

When the rotation operation is performed, the seating unit 11 is fixed to any one of the front (+ Y direction), the rear (−Y direction), the left direction (−X direction), and the right direction (X direction) in the vehicle M, for example. . Instead of this, the seating portion 11 may be fixed at an arbitrary angle. The rotation connecting portion 14 is provided with a seat direction detecting portion 14 a that detects the rotation direction of the seating portion 11 with respect to the floor surface F. A seat belt control unit 80 described later is connected to the seat direction detection unit 14a. The seat direction detection unit 14 a outputs the detection result to the seat belt control unit 80.

The backrest 12 is a member that supports the occupant's torso. As for the backrest part 12, the backrest surface 12a is formed. The backrest surface 12a is formed of a cushioning material. A headrest 13 is provided at the tip of the backrest 12. The headrest 13 supports the head or neck of an occupant seated on the seat 11. The backrest portion 12 can be in a reclining state with a rotation angle with respect to the floor surface F by the first connecting portion 18. The 1st connection part 18 has a rotation hinge structure, for example.

The first connecting portion 18 includes, for example, a biasing means (not shown) such as a rotary spring, and biases the backrest portion 12 in a direction (+ Y direction) in which the angle between the backrest portion 12 and the seating portion 11 is narrowed. Yes. When the lever 17 is released, the backrest portion 12 falls forward (+ Y direction) about the first connecting portion 18 by the urging force of the first connecting portion 18. When the occupant applies a force rearward (−Y direction) to the backrest surface 12 a in the released state of the lever 17, the backrest portion 12 falls backward about the first connecting portion 18.

FIG. 2 is a plan view showing the configuration of the occupant protection device 1 of the first embodiment. A seat belt device 20 is attached to one side of both side surfaces of the backrest 12. The position of the seat belt device 20 is determined depending on whether the vehicle seat 10 is provided on the right side or the left side with respect to the traveling direction of the vehicle M, but is not limited to this and may be changed as appropriate. May be. The seat belt device 20 may be incorporated in the backrest portion 12.

The seat belt device 20 is a three-point seat belt, and includes a belt (seat belt) 21, a winding device 22, and a drive unit 23. In the accommodated state, the belt 21 is accommodated while being wound in the winding device 22. The take-up device 22 is formed with an accommodation space (not shown) in which the wound belt 21 is accommodated. The winding device 22 includes urging means (not shown) such as a rotary spring for winding the belt 21. The belt 21 is urged in the winding direction by the urging means. When the occupant D fastens the belt 21, the belt 21 is maintained in a tension state by the urging means of the winding device 22, and the slackness of the belt 21 is reduced.

The occupant D pulls out the belt 21 from the winding device 22 and binds himself / herself to the vehicle seat 10. At this time, the belt 21 binds the abdomen of the occupant D in the horizontal direction with respect to the vehicle seat 10, and also binds the upper body of the occupant D by binding. The winding device 22 mechanically locks the drawer of the belt 21 and restrains the occupant D to the vehicle seat 10 when an acceleration greater than a predetermined value is applied. The winding device 22 is further connected to a driving unit 23 that winds the belt 21 with a driving force. The drive unit 23 is controlled by the seat belt control unit 80 as described later.

The driving unit 23 is connected to a rotating shaft for winding the belt 21, and adjusts the degree of tension of the belt 21 by increasing or decreasing the tension of the belt 21 generated by the winding device 22. Hereinafter, control of the drive unit 23 will be described.

FIG. 3 is a block diagram showing the configuration of the occupant protection device 1. The occupant protection device 1 includes a vehicle seat 10, a collision prediction unit 50, and a seat belt control unit 80. The collision prediction unit 50 includes, for example, a camera 51, a radar device 52, a finder 53, an object recognition device 54, and an external environment recognition unit 55. The collision prediction unit 50 predicts in advance a collision state that occurs in the vehicle M based on the surrounding state of the vehicle M.

The vehicle seat 10 includes a drive unit 23 that drives the winding device 22. The vehicle seat 10 includes a seat direction detection unit 14 a that detects the rotation direction of the seating unit 11. The seat belt control unit 80 controls the drive unit 23 based on the prediction result of the collision prediction unit 50 and the detection result of the seat direction detection unit 14a. The external world recognition unit 55 and the seat belt control unit 80 are realized by a processor (CPU) such as a CPU (Central Processing Unit) executing a program (software). Some or all of the functional units of the seat belt control unit 80 described below are hardware such as LSI (Large Scale Integration), ASIC (Application Specific Integrated Circuit), FPGA (Field-Programmable Gate Array), and the like. It may be realized by cooperation of software and hardware.

The camera 51 is a digital camera using a solid-state imaging device such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor). One or a plurality of cameras 51 are attached to an arbitrary portion of the vehicle M to be mounted. When imaging the front, the camera 51 is attached to the upper part of the front windshield, the rear surface of the rearview mirror, or the like. When imaging the rear, the camera 51 is attached to the upper part of the rear windshield, the back door, or the like. When imaging the side, the camera 51 is attached to a door mirror or the like. For example, the camera 51 periodically images the periphery of the vehicle M repeatedly. The camera 51 may be a stereo camera.

The radar device 52 radiates radio waves such as millimeter waves around the vehicle M and detects radio waves (reflected waves) reflected by the object to detect at least the position (distance and direction) of the object. One or a plurality of radar devices 52 are attached to any part of the vehicle M. The radar device 52 may detect the position and velocity of the object by FMCW (Frequency Modulated Continuous Wave) method.

The finder 53 is a LIDAR (Light Detection and Ranging or Laser Imaging Detection and Ranging) that measures the scattered light with respect to the irradiation light and detects the distance to the target. One or a plurality of viewfinders 53 are attached to any part of the vehicle M.

The object recognition device 54 performs sensor fusion processing on the detection results of some or all of the camera 51, the radar device 52, and the finder 53 to recognize the position, type, speed, and the like of the object. The object recognition device 54 outputs the recognition result to the external environment recognition unit 55.

The external environment recognition unit 55 recognizes the position, speed, acceleration, and other states of surrounding vehicles based on information input from the camera 51, the radar device 52, and the finder 53 via the object recognition device 54. The position of the surrounding vehicle may be represented by a representative point such as the center of gravity or corner of the surrounding vehicle, or may be represented by an area expressed by the outline of the surrounding vehicle. The “state” of the surrounding vehicle may include acceleration and jerk of the surrounding vehicle, or “behavioral state” (for example, whether or not the lane is changed or is about to be changed).

Further, the external environment recognition unit 55 may recognize the positions of guardrails, utility poles, parked vehicles, persons such as pedestrians, and other objects in addition to surrounding vehicles. Thereby, the external environment recognition unit 55 recognizes the state around the vehicle M and predicts a state in which acceleration is applied to the vehicle M due to a collision or the like. At this time, the external environment recognition unit 55 predicts the collision direction of the vehicle M based on, for example, a temporal difference in recognized information.

The external environment recognition unit 55 outputs a prediction result to the seat belt control unit 80 when it is predicted that a predetermined acceleration or more is applied to the vehicle M in the collision direction due to a collision or the like. For example, the external world recognition unit 55 predicts that a predetermined or higher acceleration is applied in the collision direction depending on whether or not a preset threshold value is exceeded.

The seat belt control unit 80 controls the drive unit 23 and the drive unit 23 based on the prediction result of the external environment recognition unit 55. When it is predicted that a predetermined acceleration or more is applied in the collision direction of the vehicle M due to a collision or the like on the vehicle M, the seat belt control unit 80 responds to the direction of the vehicle seat 10 based on the output result of the seat direction detection unit 14a. Then, the drive unit 23 is controlled to adjust the degree of tension of the belt 21.

The seat belt control unit 80 controls the driving unit 23 according to the collision direction with respect to the vehicle M predicted by the external field recognition unit 55 and the direction of the seat with respect to the vehicle M detected by the seat direction detection unit 14a to control the belt 21. Change the degree of tension.

FIG. 4 is a diagram showing the acceleration caused by the rotation state of the vehicle seat 10 at the time of a collision. For example, when the vehicle M collides forward (Y direction) with the vehicle seat 10 rotating clockwise around the rotation axis L1, an acceleration G in the decelerating direction (−Y direction) is applied to the vehicle M. At this time, an inertial force I in the forward direction (Y direction) opposite to the acceleration G is generated in the body of the occupant D. When the vehicle seat 10 faces forward (see FIG. 4A), the body of the occupant D in which the inertial force I is generated is restrained by the belt 21 on the vehicle seat 10.

For example, when the vehicle seat 10 is facing the right direction (+ X direction) (see FIG. 4B), the body of the occupant D in which the inertial force I is generated is forward (between the vehicle seat 10 and the belt 21). + Y direction). Similarly, when the vehicle seat 10 faces leftward (−X direction), the body of the occupant D in which the inertial force I is generated may move forward (+ Y direction). In this state, it is desirable that the restraining force of the belt 21 when the vehicle seat 10 is directed rightward or leftward is increased as compared with the case where the vehicle seat 10 is directed forward. Therefore, in the occupant protection device 1, the binding force of the belt 21 is changed according to the collision direction with respect to the direction viewed from the vehicle seat 10.

FIG. 5 is a diagram for defining a direction range with respect to a direction viewed from the vehicle seat 10. The directions viewed from the vehicle seat 10 with respect to the vehicle seat 10 are the four directions of front, rear, left and right. An angle range including each of these four directions is set. For example, a predetermined angle range including the front direction when viewed from the vehicle seat 10 includes a first direction range, a predetermined angle range including the right direction when viewed from the vehicle seat 10 includes a second direction range, and a rear direction when viewed from the vehicle seat 10. The predetermined angle range is defined as the third direction range, and the predetermined angle range including the left direction when viewed from the vehicle seat 10 is defined as the fourth direction range.

The predetermined angle range is set to 90 °, for example. A collision in which a collision direction included in the first direction range occurs is referred to as a front collision. A collision in which a collision direction included in the second direction range occurs is called a right collision. A collision in which a collision direction included in the third direction range occurs is called a rear collision. A collision in which a collision direction included in the fourth direction range occurs is called a left collision. In the occupant protection device 1, the seat belt device 20 is controlled in accordance with the relationship between the respective direction ranges including the front, rear, left and right directions when viewed from the vehicle seat 10 and the angle of the vehicle seat 10 and the collision direction.

FIG. 6 is a diagram illustrating a state in which a collision occurs when the vehicle seat 10 is rotated. Here, a state in which the vehicle seat 10 is rotating in the right direction with respect to the vehicle M is illustrated. The relative collision direction θ with respect to the vehicle seat 10 is estimated as the direction in which the inertial force I generated by the deceleration acceleration G applied to the occupant D is generated.

Before the collision occurs in the vehicle M, the external environment recognition unit 55 predicts the collision direction θ1 with respect to the vehicle M. The seat direction detection unit 14 a detects the seat angle θs of the vehicle seat 10 with respect to the vehicle M. The seat belt control unit 80 calculates the relative collision direction θ with respect to the vehicle seat 10 according to the equation (1) based on the collision direction θ1 and the seat angle θs.
θ = θ1-θs (1)

The seat belt controller 80 determines in which direction range the relative collision direction θ with respect to the vehicle seat 10 is included. In the above example, the relative collision direction θ is included in the first direction range including the front direction when viewed from the vehicle seat 10. Accordingly, the seat belt control unit 80 determines that a front collision occurs with respect to the vehicle seat 10 and performs control according to the front collision with respect to the seat belt device 20.

The seat belt control unit 80 controls the driving unit 23 to wind up the belt 21, and adjusts the degree of tension of the belt 21 to a first degree corresponding to the front side collision with the vehicle seat 10. The first degree is set by the optimum output and load control according to the front side collision between the pretensioner output of the seat belt device 20 and the load limiter load. For example, the first degree is adjusted by increasing the pretensioner output and the load limiter load by 80% of the normal state.

Here, the “normal state” is defined as a state in which no collision is predicted and the seat belt control unit 80 does not perform any control on the seat belt device 20. Instead of “an increase of 80% in the normal state”, it may be “80% of the case where the control is performed with the strongest force as 100%”. The same applies to the following description.

When the seat belt control unit 80 determines that the relative collision direction θ with respect to the vehicle seat 10 is included in the second direction range, the seat belt control unit 80 determines that a right collision occurs with respect to the vehicle seat 10, and the seat belt device 20. Is controlled according to the right-side collision. As described above, in the right side collision with the vehicle seat 10, it is necessary to adjust the degree of tension of the belt 21 relatively higher than in the front side collision. Accordingly, the seat belt control unit 80 controls the driving unit 23 to adjust the degree of tension of the belt 21 to a second degree higher than the first degree.

Similarly, when the seat belt control unit 80 determines that the relative collision direction θ with respect to the vehicle seat 10 is included in the fourth direction range, the seat belt control unit 80 determines that the left collision occurs with respect to the vehicle seat 10 and drives The portion 23 is controlled to adjust the degree of tension of the belt 21 to a second degree higher than the first degree. The second degree is adjusted by increasing the pretensioner output and the load limiter load by 100% of the normal state. That is, according to the occupant protection device 1, the possibility that the occupant D is thrown out of the vehicle seat 10 when a side collision with the vehicle seat 10 occurs is reduced.

When the seat belt control unit 80 determines that the relative collision direction θ with respect to the vehicle seat 10 is included in the third direction range, the seat belt control unit 80 determines that a rear collision occurs with respect to the vehicle seat 10. Judgment is performed, and the seat belt device 20 is controlled according to the rear collision. In the rear collision, since the backrest 12 supports the body of the occupant D, the adjustment of the degree of tension of the belt 21 may be lower than the first degree. When the seat belt control unit 80 determines that a rear collision occurs with respect to the vehicle seat 10, the seat belt control unit 80 controls the drive unit 23 to adjust the degree of tension of the belt 21 to a third degree lower than the first degree.

The third degree is adjusted by, for example, increasing the pretensioner output and the load limiter load by 50% of the normal state. That is, according to the occupant protection device 1, it is possible to prevent the occupant D from being excessively restrained by the belt 21 when a rear collision with the vehicle seat 10 occurs.

FIG. 7 is a diagram illustrating a control state of the seat belt device 20 applied in the relationship between the collision direction with respect to the vehicle M and the seat direction. In FIG. 7, control (1), control (2), and control (3) correspond to the first degree, the second degree, and the third degree, respectively. As shown in the figure, the seat belt control unit 80 controls the seat belt device 20 according to the relationship between the collision direction with respect to the vehicle M and the seat direction.

Next, the processing flow of the occupant protection device 1 will be described. FIG. 8 is a flowchart showing a processing flow of the occupant protection device 1.

The external environment recognition unit 55 acquires information around the vehicle M based on information input from the camera 51, the radar device 52, and the finder 53 via the object recognition device 54 (step S100). The external environment recognition unit 55 predicts whether or not a predetermined or higher acceleration is applied to the vehicle M based on information around the vehicle M and a collision direction with the vehicle M (step S110).

When the outside recognition unit 55 predicts that a predetermined acceleration or more is applied to the vehicle M, the outside recognition unit 55 outputs the predicted acceleration and the collision direction to the seat belt control unit 80. The seat belt control unit 80 controls the drive unit 23 according to the collision direction with respect to the vehicle M predicted by the external recognition unit 55 and the direction of the vehicle seat 10 with respect to the vehicle M detected by the seat direction detection unit 14a. The degree of tension of the belt 21 is changed (step S120).

According to the above-described occupant protection device 1 of the first embodiment, when a collision occurs in the vehicle M, the collision direction of the vehicle M and the rotation state of the vehicle seat 10 are detected, so that the direction depends on the direction of the vehicle seat 10. The degree of tension of the belt 21 can be adjusted, and safety in protecting the occupant D can be enhanced.

Second Embodiment
The occupant protection device 1 of the first embodiment protects the occupant by changing the degree of tension of the belt 21 based on the collision prediction of the vehicle M by the collision prediction unit 50. In the second embodiment, in addition to the collision prediction, the degree of tension of the belt 21 is changed according to the situation of the vehicle M generated after the collision.

FIG. 9 is a block diagram showing the configuration of the occupant protection device 2 of the second embodiment. In the occupant protection device 2 of the second embodiment, a collision detection unit 40 is further added to the configuration of the occupant protection device 1. The collision detection unit 40 includes, for example, a six-axis acceleration sensor and a strain gauge. The collision detection unit 40 detects the acceleration of the vehicle M and the deformation of the vehicle body that occur at the time of the collision. The seat belt control unit 80 determines a collision mode such as a collision speed, a degree of impact, a deformation of the vehicle body, and a rotation of the vehicle body that occur in the vehicle M based on the detection result of the collision detection unit 40.

The seat belt control unit 80 controls the driving unit 23 of the seat belt device 20 in accordance with the collision mode of the vehicle M determined based on the detection result of the collision detection unit 40, and changes the degree of tension of the belt 21. For example, when it is determined that a rollover (overturn; an example of predetermined rotation) has occurred in the vehicle M, the seat belt control unit 80 controls the driving unit 23 to set the degree of tension of the belt 21 to a third degree, for example. To a lower fourth degree. The overturning means a state in which the vehicle M rotates in the roll direction or the pitch direction and reaches the state where the wheel is directed in the lateral direction or the upward direction (or passes through the state).

The fourth degree is adjusted, for example, by increasing the pretensioner output and the load limiter load by 30% of the normal state. The seat belt control unit 80 controls the driving unit 23 of the seat belt device 20 when the posture of the vehicle M stops in an overturned state after the vehicle M is overturned, and the degree of tension of the belt 21 does not cause a predetermined rotation. It may be adjusted lower than the degree of tension in the case so that the occupant D can easily escape from the vehicle seat 10.

That is, according to the occupant protection device 2, when a rollover occurs with respect to the vehicle seat 10, the occupant D is appropriately restrained to the vehicle seat 10 and the occupant D is prevented from being excessively restrained by the belt 21. . As a result, it is possible to prevent the occupant D who is about to escape from the overturned vehicle M from being prevented from removing the belt 21.

FIG. 10 is a diagram illustrating a control state of the seat belt device 20 applied in the relationship between the collision direction with respect to the vehicle M and the seat direction. In FIG. 10, control (1), control (2), control (3), and control (4) correspond to the first degree, the second degree, the third degree, and the fourth degree, respectively. As shown in the drawing, the seat belt control unit 80 controls the seat belt device 20 according to the relationship between the collision direction with respect to the vehicle M and the seat direction, and also controls the seat belt device 20 depending on the collision mode of the vehicle M. . The control of the seat belt device 20 according to the collision mode of the vehicle M may appropriately set another degree of tension according to another collision mode in addition to the rollover.

Next, the processing flow of the occupant protection device 2 will be described. FIG. 11 is a flowchart showing a processing flow of the occupant protection device 2. Steps 200 to 220 are the same as those in the first embodiment. The collision detection unit 40 detects a change that occurs in the vehicle M when the vehicle M collides. Whether the seat belt control unit 80 changes the degree of tension of the belt 21 by controlling the driving unit 23 of the seat belt device 20 according to the collision mode of the vehicle M based on the detection result of the collision detection unit 40. Is determined (step 230). When the seat belt control unit 80 determines that the degree of tension of the belt 21 is changed according to the collision mode of the vehicle M (step 230: Yes), the tension of the belt 21 is controlled by controlling the driving unit 23 according to the collision mode. The degree is changed (step S240).

According to the occupant protection device 2 of the second embodiment described above, the degree of tension of the belt 21 can be changed according to the collision mode by determining the collision mode when the vehicle M collides. According to the occupant protection device 2, the degree of tension of the belt 21 can be changed according to the collision mode of the vehicle M that changes due to an actual collision, and thus the safety in protecting the occupant D can be further improved.

As mentioned above, although the form for implementing this invention was demonstrated using embodiment, this invention is not limited to such embodiment at all, In the range which does not deviate from the summary of this invention, various deformation | transformation and substitution Can be added.

DESCRIPTION OF SYMBOLS 1 ... Passenger protection apparatus, 2 ... Passenger protection apparatus, 10 ... Vehicle seat, 11 ... Seating part, 11a ... Seat surface, 12 ... Backrest part, 12a ... Backrest surface, 13 ... Headrest, 14 ... Rotation connection part, 14a ... Seat Direction detection unit, 17 ... lever, 18 ... first connection unit, 20 ... seat belt device, 21 ... belt, 22 ... winding device, 23 ... drive unit, 40 ... collision detection unit, 50 ... collision prediction unit, 51 ... Camera 52 ... Radar device 53 ... Finder 54 ... Object recognition device 55 ... External recognition unit 80 ... Seat belt control unit M ... Vehicle

Claims

A collision prediction unit for predicting a collision state including a collision direction of the vehicle;
A seat direction detection unit that detects a direction of the seat that is rotatable about a vertical axis of the vehicle with respect to the vehicle;
A drive unit for adjusting the degree of tension of the seat belt;
The degree of tension of the seat belt is changed by controlling the driving unit in accordance with the collision direction with respect to the vehicle predicted by the collision prediction unit and the direction of the seat with respect to the vehicle detected by the seat direction detection unit. A control unit to
An occupant protection device.
The control unit controls the driving unit to adjust the degree of tension of the seat belt to a first degree when the collision direction is included in a predetermined angle range including a front direction when viewed from the seat.
The occupant protection device according to claim 1.
When the collision direction is included in a predetermined angle range including either the left direction or the right direction when viewed from the seat, the control unit controls the drive unit to control the degree of tension of the seat belt. Adjust to a second degree higher than the first degree,
The occupant protection device according to claim 2.
When the collision direction is included in a predetermined angle range including a rear direction when viewed from the seat, the control unit controls the driving unit to reduce the tension degree of the seat belt lower than the first degree. Adjust to 3 degrees,
The occupant protection device according to claim 2.
A collision detection unit for detecting a collision occurring in the vehicle;
The control unit determines a collision mode of the vehicle based on a detection result of the collision detection unit, and controls the driving unit according to the collision mode to change the degree of tension of the seat belt.
The occupant protection device according to claim 1.
When the control unit determines that a predetermined rotation is generated in the vehicle due to the collision based on the detection result of the collision detection unit, the control unit controls the driving unit to determine the degree of tension of the seat belt, Adjusting lower than the degree of tension in the case where the predetermined rotation has not occurred in the vehicle,
The occupant protection device according to claim 5.
A collision prediction unit that predicts a collision state including a vehicle collision direction, a seat direction detection unit that detects a direction of a seat that is rotatable about a vertical axis of the vehicle, and a drive that adjusts the degree of tension of the seat belt A control computer for an occupant protection device comprising:
Controlling the drive unit according to the collision direction with respect to the vehicle predicted by the collision prediction unit and the direction of the seat with respect to the vehicle detected by the seat direction detection unit;
Changing the degree of tension of the seat belt,
Control method of occupant protection device.
A collision prediction unit that predicts a collision state including a vehicle collision direction, a seat direction detection unit that detects a direction of a seat that is rotatable about a vertical axis of the vehicle, and a drive that adjusts the degree of tension of the seat belt A control computer for an occupant protection device comprising:
The driving unit is controlled according to the collision direction with respect to the vehicle predicted by the collision prediction unit and the direction of the seat with respect to the vehicle detected by the seat direction detection unit,
Changing the degree of tension of the seat belt,
program.